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Operating Systems AIX AIX understanding memory using Post 303039589 by zxmaus on Thursday 10th of October 2019 01:23:19 AM
Old 10-10-2019
well I would like to add that you need to make sure that you always always need to have enough real free memory to support the IOs your system needs to do. If you dont, your system will stop ALL work and starts scanning and freeing up memory pages until there is sufficient free memory available and than restarts processing. If you are very low in free memory and your system had to do this frequently on a box with lots of IO, like a DB box, this is much worse for your performance than if you would run from paging space and it can grind a busy box to a complete halt - a fact that IBM support to this day prefers to completely ignore.
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MEMORY_PRESSURE(1)					    BSD General Commands Manual 					MEMORY_PRESSURE(1)

NAME
memory_pressure -- Tool to apply real or simulate memory pressure on the system. SYNOPSIS
memory_pressure [-l level] | [-p percent_free] | [-S -l level] OPTIONS
-l <level> Apply real or simulate memory pressure (if specified alongside simulate argument) on the system till low memory notifications cor- responding to <level> are generated. Supported values are "warn" and "critical". -p <percent_free> Allocate memory till the available memory in the system is <percent_free> of total memory. If the percentage of available memory to total memory on the system drops, the tool will free memory till either the desired percentage is achieved or it runs out of memory to free. -S Simulate memory pressure on the system by placing it artificially for <sleep_seconds> duration at the "warn" or "critical" level. -s <sleep_seconds> Duration to wait before allocating or freeing memory if applying real pressure. In case of simulating memory pressure, this is the duration the system will be maintained at an artifical memory level. DESCRIPTION
A tool to apply real or simulate memory pressure on the system SEE ALSO
vm_stat(1) Mac OS X Mar 7, 2013 Mac OS X
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